Legacy ImageMagick Discussions Archive

Thank you,
But TID2008 distorted with noise,but i need image database with vary contrast level.
For example: suppose original image is clean image (and reference) and 10 image from reference image but with several level contrast or haze from reference image.

hello,
I need image database the same TID2008 but instead distorted with noise, distorted with light,contrast or added haze to image.
We have such a database?
Thanks

It's a standard blending function. If you know three of the four variables (out, A, B, s) you can easily calculate the fourth, for example: A = (out - B*s) / (1-s) Thank you for your reply, yes, but when watermark image in the cover image(A and B) , we lost A and B in watermark image. We just s and ...

Thank you for your reply,
The below formula is your formula? or it's from other papers?
out = A*(1-s) + B*s

We have out intensity and watermark is fine.
Now with Scale(for example : 0.5 ) and out ,how we can extract A and B ?

We have the below formula

Watermarked= A + (s*B).

If A and B between 0 and 255, for example we have:

S = 0.5 , A = 250 and B = 245


Watermarked = 250 + (0.5*245) = 372.5 !!!
But each pixel is 8-bit and should be between 0 <= intensity <= 255 .

Emailed to the owner article and answered me, now could you give me more explain about it? Embedding a matrix into another one can do as matrix addition. Scaling factor is used for obtaining the invisibleness of the watermark. Pls find the below. Watermarked= A + (s*B). Here A &B are matrices of ...

Sure,
Reference article is here and we can read it free.
http://www.sciencedirect.com/science/ar ... 0915001945

Hello, I reading an article and i can't understand well about scaling factor. Could you give me definition and example about scaling factor? How can embed one matrix to other matrix with scaling factor? Thanks http://s6.uplod.ir/i/00791/5n2zdovoqtd9.png http://s6.uplod.ir/i/00792/k687xdweoztj.png

Thank you for your reply,
I do not know about it.
No explanation was given in the question. just it:
what is your suggestion in image processing for detection quality for pizza?

I wrote we use segmentation .

No,This question was in our final exam but interesting for me.
I wrote we use segmentation .

Hello,
Generally, what is your suggestion in image processing for detection quality for pizza?
I think segmentation is good
Thanks

Hello,
Why in pure 'HE' isn't good for images with cumulative in black or white region in histogram? Thanks
For example:

Hello, Could you explain it? mean shift problem of traditional histogram equalization technique to some extent.

Hello,
--Why is the watermark embedded into image instead of just inserting it into the file header?
2- What is the drawback of inserting additional information into images?(in watermarking)
Thanks

Hello, These are the same color space? HSV HSB HSL ? Thanks